Artificial tooth.



I. .STERN.

ARTIFICIAL TOOTH.

APPLICATION FILED AUG 17, 1911.

Patented Nov. 14, 1911.-

"WEI/TOR ATTORNEYS rsmonn smart, on NEW YORK. N; Y.

ARTIFICIAL TOOTH.

To all 'whom it may concern:

Be it known that I, Ismoan STERN, of the city, county, and State of New York,

. have invented a new and useful Improvement in Artificial Teeth, of which the following is a specification.

This invention relates to artificial teeth. It is the practice to set a couple of pins transversely in the porcelain body of the tooth, for holding the porcelain and a suitable backing together. For good work the pins are of platinum, and are inserted in the porcelain while the latter is plastic, after which the porcelain is baked with the pins 15' in it, so that the pins are firml held. The

' ins are passed through the bac ing and are bent over at approximately a right angle against thesame to hold it to the porcelain. It is very important that the backing and the porcelain be held together reliably, but sometimes the bent pins do not do this. Moreover, the bending of the pins is liable to break the porcelain, which is very brittle. This necessitates the making of a new tooth; or the crack or weakening may not .be apparent at the time, but will make itself manifest after the tooth is in use.

It is the object of this invention to pro vide for a much better and stronger holding ing and to old the same securely. This than is secured by the ordinary bent pins,

to avoid the danger of breaking or weaken ing the porcelain, and incidentally to enable less metal to be used in the pins, which when platinum is used is a very important advantage. body or porcelain facing and the backing in a novel manner, utilizing a novel form of pm.

In accordance with my invention, the projection of the in be and the porcelain is tubular, and o suita le length and structural stren h to be upset against the back- 0 eration of upsetting or riveting over th ed of the tubular pin is extremely simp e an does not endanger the porcelain. Moreover, the backing is held-to the porcelain more securely-than heretofore, because the of bent to one side only as with ordiary pms'. These are important eonsidei'a n tions, and there is also a greatadvanta a ga the material saving of metal occasion Specification of Letters Patent.

Epplicatlon filed August 17, 1911.

To these ends I unite the tooth' of the Patente d Nov. 14, 1911.

Serial No. 844,669.

the use of my pins. In the first place the new pin is much shorte1 than the ordinary PlIlS, because but a shor; length of tubular projection is needed fol upsetting as compared with a considerat le length for bending of a pin as a whole to one side. Fur r thermore, the upset por IlOIl is hollow, and not of solid metal. Preferably, the portion of the pin that is set in the porcelain is solid, while the porticn that projects is hollow or tubular for u setting. This combination gives the best I zsults in the way of strength and security. Such a pin may be made in any suitable manner. It is preferably entirely of platinum, but it might be of other metal. a

In the accompanying drawings illustrating the preferred embo( .iment of the invention: Figure 1 is a per: pective view, showing a porcelain tooth wf th a backing united thereto by a couple of m y pins upset against the backing; Fig.1 2 is a longitudinal section through the tooth )efore upsetting the pins; Fig. 3 is a parti 1.1 longitudinal section through the toot mowing the tubular part of the pin-upset (r headed over; and Fig. 4 is a perspective view of one of the pins.

In these views, 1 is t'. 1e porcelain body or tooth proper; 2 is a c1.stomary gold backing pressed close a iist the back of the porcelain; and 3 design ttes the pins. These pins are preferably be] :ed in the porcelain. The portions 4 which a re embedded therein are shown solid,'while the projecting portions 5 are tubular. T [688 tubular pro ecting portions, which are comparatively short, are passed through ope rings in the backing. Asimple operation now shown in Fi 1 and L The edges of the tubular portions of th pins arepreferabg chamfered oil, as indie ite'd at 6. Theen' ortions embed led the porcelain are pre erably enlarge 1, as indicated at 7, to insure the retention of-the pins therein. When the tubularpor ions of the ins are upset inst the rear face of the ackin'g, thply hold the backimg'and the porcelain; b y together with great firmness, the; clamping action be ng at all sides; of the in upsets them, as

ice.

It w'llie understood am the tubular I I tion ofuny is dist inctly different the be y, said pin comprising a headed solid portion set in the body and a tubular portion projecting therefrom and adapted to be upset against the backing, substantially as de; 10 scribed. :.1

In'witness whereof, I have hereunto set my hand this 31st day of July, 1911..

ISIDORE STERN In the presence of .MAURICE HOTCHNER, ARTHUR WATSON. 

